发明名称 |
OPTICAL DISK AND OPTICAL DISK DRIVE |
摘要 |
An optical disk according to the present invention has thereon an uninterrupted preformed groove adjoining a track. The address information of the track and sectors is prerecorded by variations in the preformed groove in a radial direction of the optical disk. An optical disk drive converts a detection signal, that is generated when the spot of a light beam crosses the track, into a binary signal in accordance with the comparison between the detection signal and two different slice levels, whereby a correct track crossing number is obtained. Another optical disk has thereon index marks that are prerecorded by partially varying the width of the preformed groove. Another optical disk drive detects the index mark on a specific track line, whereby formatting data with respect to address information is generated. The optical disks and optical disk drives are thus compatible with writing of the address information by means of soft-formatting.
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申请公布号 |
CA2055711(C) |
申请公布日期 |
1997.10.14 |
申请号 |
CA19912055711 |
申请日期 |
1991.11.15 |
申请人 |
SHARP KABUSHIKI KAISHA |
发明人 |
FUJI, HIROSHI;MATOBA, HIROTSUGU |
分类号 |
G11B7/007;G11B7/085;G11B7/09;G11B7/24;G11B11/105;G11B27/19;G11B27/24;(IPC1-7):G11B7/007 |
主分类号 |
G11B7/007 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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